Foundry is amazing. I used Roll20 for years (5e and a bit of PF2e), found it to be a bit unintuitive, albeit free. You can do most things in the system, but the plug-ins available for Foundry are miles and leagues better. Also, macros are a bit tough. I can't imagine running PF2e in the system for very long, especially for complex classes like Alchemist or Thaumaturge.
I'm currently a player in a Fantasy Grounds campaign (5e). As a player, it's fine. I don't like the interface very much, but it's fine for 5e which is already a pretty light system. Panning on maps, targeting enemies is frustrating and I feel like I have too many windows open at any given time.
Been using Foundry just shy of a year, DMing 3 games. It's amazing. Plug-ins for anything you need - ranging from DM QoL upgrades like Simple Calendar, atmospheric upgrades like music bundles, the always incredible Pathmuncher, and class-specific tools like the Thamaturge package. The built-in Compendium for PF2e makes DMing so easy, I can look literally everything up and most things have macros pre-built. Hosting from my PC was a bit harder, but doable.
Currently learning how to make custom macros, which has been tough, but there's a huge community and usually you can copy-paste details from other abilities.
Do you have any specific questions about the software?